Just put one down, make sure their not twisted (unless you like the look of them being twisted, but be consistent), and pick up the new color and start knitting with it. Leave enough slack on it so that it's not scrunching up the knitting by connecting tightly from the row below.
Hope that helps.
KnittingHelp Queen Bee
It is not because things are so difficult that we do not dare; it is because we do not dare that they are difficult.